Well, I am 6' 1.5" and a slender 230 lbs and I have not had a complaint other than my old model SPF had too low of a butt cushion which was easily fixed with some padding, which I did. I am mostly legs too when you disect my height. Jamo looks assolutely smug and snug in his setup.
I think you will be fine with a J model. Get 'em while supplies last!